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Refactor pgstat_prepare_io_time() with an input argument instead of a GUC

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Originally, this routine relied on track_io_timing to check if a time
interval for an I/O operation stored in pg_stat_io should be initialized
or not.  However, the addition of WAL statistics to pg_stat_io requires
that the initialization happens when track_wal_io_timing is enabled,
which is dependent on the code path where the I/O operation happens.

Author: Nazir Bilal Yavuz
Discussion: https://postgr.es/m/CAN55FZ3AiQ+ZMxUuXnBpd0Rrh1YhwJ5FudkHg=JU0P+-W8T4Vg@mail.gmail.com
This commit is contained in:
Michael Paquier
2023-12-16 20:16:20 +01:00
parent a6be0600ac
commit 3c9d9acae0
5 changed files with 22 additions and 12 deletions
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10
src/backend/storage/buffer/bufmgr.c
View File

@ -1143,7 +1143,7 @@ ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
MemSet((char *) bufBlock, 0, BLCKSZ);
else
{
instr_time io_start = pgstat_prepare_io_time();
instr_time io_start = pgstat_prepare_io_time(track_io_timing);
smgrread(smgr, forkNum, blockNum, bufBlock);
@ -2070,7 +2070,7 @@ ExtendBufferedRelShared(BufferManagerRelation bmr,
}
}
io_start = pgstat_prepare_io_time();
io_start = pgstat_prepare_io_time(track_io_timing);
/*
* Note: if smgrzeroextend fails, we will end up with buffers that are
@ -3523,7 +3523,7 @@ FlushBuffer(BufferDesc *buf, SMgrRelation reln, IOObject io_object,
*/
bufToWrite = PageSetChecksumCopy((Page) bufBlock, buf->tag.blockNum);
io_start = pgstat_prepare_io_time();
io_start = pgstat_prepare_io_time(track_io_timing);
/*
* bufToWrite is either the shared buffer or a copy, as appropriate.
@ -4181,7 +4181,7 @@ FlushRelationBuffers(Relation rel)
PageSetChecksumInplace(localpage, bufHdr->tag.blockNum);
io_start = pgstat_prepare_io_time();
io_start = pgstat_prepare_io_time(track_io_timing);
smgrwrite(RelationGetSmgr(rel),
BufTagGetForkNum(&bufHdr->tag),
@ -5614,7 +5614,7 @@ IssuePendingWritebacks(WritebackContext *wb_context, IOContext io_context)
sort_pending_writebacks(wb_context->pending_writebacks,
wb_context->nr_pending);
io_start = pgstat_prepare_io_time();
io_start = pgstat_prepare_io_time(track_io_timing);
/*
* Coalesce neighbouring writes, but nothing else. For that we iterate

4
src/backend/storage/buffer/localbuf.c
View File

@ -246,7 +246,7 @@ GetLocalVictimBuffer(void)
PageSetChecksumInplace(localpage, bufHdr->tag.blockNum);
io_start = pgstat_prepare_io_time();
io_start = pgstat_prepare_io_time(track_io_timing);
/* And write... */
smgrwrite(oreln,
@ -411,7 +411,7 @@ ExtendBufferedRelLocal(BufferManagerRelation bmr,
}
}
io_start = pgstat_prepare_io_time();
io_start = pgstat_prepare_io_time(track_io_timing);
/* actually extend relation */
smgrzeroextend(bmr.smgr, fork, first_block, extend_by, false);

4
src/backend/storage/smgr/md.c
View File

@ -1189,7 +1189,7 @@ register_dirty_segment(SMgrRelation reln, ForkNumber forknum, MdfdVec *seg)
ereport(DEBUG1,
(errmsg_internal("could not forward fsync request because request queue is full")));
io_start = pgstat_prepare_io_time();
io_start = pgstat_prepare_io_time(track_io_timing);
if (FileSync(seg->mdfd_vfd, WAIT_EVENT_DATA_FILE_SYNC) < 0)
ereport(data_sync_elevel(ERROR),
@ -1586,7 +1586,7 @@ mdsyncfiletag(const FileTag *ftag, char *path)
need_to_close = true;
}
io_start = pgstat_prepare_io_time();
io_start = pgstat_prepare_io_time(track_io_timing);
/* Sync the file. */
result = FileSync(file, WAIT_EVENT_DATA_FILE_SYNC);

14
src/backend/utils/activity/pgstat_io.c
View File

@ -92,15 +92,25 @@ pgstat_count_io_op_n(IOObject io_object, IOContext io_context, IOOp io_op, uint3
have_iostats = true;
}
/*
* Initialize the internal timing for an IO operation, depending on an
* IO timing GUC.
*/
instr_time
pgstat_prepare_io_time(void)
pgstat_prepare_io_time(bool track_io_guc)
{
instr_time io_start;
if (track_io_timing)
if (track_io_guc)
INSTR_TIME_SET_CURRENT(io_start);
else
{
/*
* There is no need to set io_start when an IO timing GUC is disabled,
* still initialize it to zero to avoid compiler warnings.
*/
INSTR_TIME_SET_ZERO(io_start);
}
return io_start;
}

2
src/include/pgstat.h
View File

@ -519,7 +519,7 @@ extern bool pgstat_bktype_io_stats_valid(PgStat_BktypeIO *backend_io,
BackendType bktype);
extern void pgstat_count_io_op(IOObject io_object, IOContext io_context, IOOp io_op);
extern void pgstat_count_io_op_n(IOObject io_object, IOContext io_context, IOOp io_op, uint32 cnt);
extern instr_time pgstat_prepare_io_time(void);
extern instr_time pgstat_prepare_io_time(bool track_io_guc);
extern void pgstat_count_io_op_time(IOObject io_object, IOContext io_context,
IOOp io_op, instr_time start_time, uint32 cnt);